package cn.wh.beans.factory.support;

import cn.wh.beans.BeansException;
import cn.wh.beans.factory.FactoryBean;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author: wh
 * @create: 2022-11-08 14:56
 * @description
 **/
public abstract class FactoryBeanRegistrySupport extends DefaultSingletonBeanRegistry {

    private final Map<String, Object> factoryBeanObjectCache = new ConcurrentHashMap<String, Object>();


    protected Object getCachedObjectForFactoryBean(String beanName){
        Object object = this.factoryBeanObjectCache.get(beanName);
        return (object!=NULL_OBJECT?object:null);
    }

    protected Object getObjectFromFactoryBean(FactoryBean factory,String beanName){
        if (factory.isSingleton()){
            Object object = this.factoryBeanObjectCache.get(beanName);
            if (object==null){
                object = doGetObjectFromFactoryBean(factory, beanName);
                this.factoryBeanObjectCache.put(beanName,(object!=null?object:NULL_OBJECT));
            }
            return (object!=NULL_OBJECT?object:null);
        }else{
            return doGetObjectFromFactoryBean(factory,beanName);
        }
    }

    private Object doGetObjectFromFactoryBean(final FactoryBean factory,final String beanName){
        try {
            return factory.getObject();
        } catch (Exception e) {
            throw new BeansException("FactoryBean threw exception on object[" + beanName + "] creation", e);
        }
    }





}
